US4521374A - Fuel grid with sleeves welded in notched grid straps - Google Patents

Fuel grid with sleeves welded in notched grid straps Download PDF

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Publication number
US4521374A
US4521374A US06/414,232 US41423282A US4521374A US 4521374 A US4521374 A US 4521374A US 41423282 A US41423282 A US 41423282A US 4521374 A US4521374 A US 4521374A
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US
United States
Prior art keywords
straps
grid
edges
sleeve
pair
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/414,232
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English (en)
Inventor
Robert Duncan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Westinghouse Electric Co LLC
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Assigned to WESTINGHOUSE ELECTRIC CORPORATION; WESTINGHOUSE BLDG., GATEWAY CENTER, PITTSBURGH, PA. 15222 A CORP OF PA. reassignment WESTINGHOUSE ELECTRIC CORPORATION; WESTINGHOUSE BLDG., GATEWAY CENTER, PITTSBURGH, PA. 15222 A CORP OF PA. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DUNCAN, ROBERT
Priority to US06/414,232 priority Critical patent/US4521374A/en
Priority to IL69503A priority patent/IL69503A0/xx
Priority to ZA836077A priority patent/ZA836077B/xx
Priority to GR72316A priority patent/GR78938B/el
Priority to FR8313896A priority patent/FR2532462B1/fr
Priority to EG532/83A priority patent/EG16815A/xx
Priority to ES525263A priority patent/ES8702697A1/es
Priority to BR8304815A priority patent/BR8304815A/pt
Priority to BE211441A priority patent/BE897642A/fr
Priority to DE8383305078T priority patent/DE3375341D1/de
Priority to KR1019830004116A priority patent/KR910004192B1/ko
Priority to EP83305078A priority patent/EP0103444B1/en
Priority to JP58159148A priority patent/JPS5960386A/ja
Publication of US4521374A publication Critical patent/US4521374A/en
Application granted granted Critical
Assigned to WESTINGHOUSE ELECTRIC CO. LLC reassignment WESTINGHOUSE ELECTRIC CO. LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CBS CORPORATION (FORMERLY KNOWN AS WESTINGHOUSE ELECTRIC CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/34—Spacer grids
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/34—Spacer grids
    • G21C3/356—Spacer grids being provided with fuel element supporting members
    • G21C3/3566—Supporting members formed only of elements fixed on the strips
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • This invention in its preferred form, relates to a fuel grid assembly having sleeves welded to it. More particularly, the invention relates to such an assembly in which the grid straps forming certain of the cells are provided with notches, and a cylindrical sleeve is seated in the notches.
  • nuclear fuel bundle assemblies which include a matrix of nuclear fuel rods which are arrayed in rows and columns, and held in such configuration by a plurality of fuel rod grids. These grids are formed of straps which are slotted, so that the straps mate, one strap entering into the slot of the other strap at each point of intersection. Control rods are included at selected positions within the array of nuclear fuel rods. These control rods are received in guide sleeves which are welded to the grid. More particularly, there has been provided in the past a construction in which the straps forming the grid had edges which were substantially in a common plane, and a plurality of guide sleeves were provided, each seated on four straps defining a common cell.
  • the outside diameter of the cylindrical guide sleeve was such as to permit the base of the cylindrical guide sleeve to rest upon the edges of four straps forming a single cell, it being understood that guide sleeves were provided only at spaced cells, and not at adjacent cells.
  • the guide sleeves were butt welded onto the straps forming the particular cell at the upper edge of each of the four straps.
  • This procedure required that the grid, after assembly, be machined to insure that the edges of the four straps forming the particular cell to which the cylindrical sleeve was to be welded lay as closely as possible in a common plane, and this required a fabrication step known as "spot facing".
  • spot facing was time consuming and costly, requiring the use of a suitable machine and fixtures, as well as the expenditure of a workman's time.
  • the requirement for relatively great precision in the location of the strap edges is based on the fact that if a gap greater than 0.005 inches remains between the sleeve and the edge of the grid strap, the weld which is effected may well be defective, in that the fused metal will not extend entirely beneath that portion of the base of the cylindrical sleeve which is intended to engage the upper edge of the grid strap; the occurrence of a gap will result in either lack of welding or no welding, either of which is unsatisfactory.
  • a fuel grid assembly made up of mating straps which are punched from a continuous strip of material, the straps having slots therein.
  • the assembled grid of mating slotted straps thereby has a large number of cells, each defined by four straps.
  • Certain of the cells have notches in the four straps which define and form the cell, in the upper edge thereof, each notch being rectangular, with one edge thereof parallel to the edge of the strap, and a pair of edges perpendicular thereto.
  • the notches are each located centrally along that portion of the strap extending between the two perpendicular straps which are next adjacent to it.
  • the cylindrical sleeve is seated in the four notches formed in the four straps defining the cell, the outer diameter of the cylindrical sleeve being substantially the same as the distance between the outside surfaces of the four straps forming the cell; the bottom or base of the cylindrical sleeve engages the edge of each notch which is parallel to the edge of the strap of which it forms a part, and also substantially engages the two edges perpendicular thereto.
  • the cylindrical sleeve thus has an interference fit with the seat formed by the four notches. Welding is achieved by welding the pair of edges and the cylindrical sleeve of one notch, and the pair of edges and cylindrical sleeve of the diametrically opposite notch.
  • FIG. 1 is a perspective view of a nuclear fuel bundle assembly
  • FIG. 2A is a perspective view of a grid, with sleeves thereon;
  • FIG. 2B is a plan view, showing a portion of the grid and several sleeves on an enlarged scale
  • FIG. 2C is a cross-sectional view taken on the line 2C--2C of FIG. 2B;
  • FIG. 2D is a cross-sectional view taken along the line 2D--2D of FIG. 2B.
  • the apparatus and method of this invention are specifically designed as part of the manufacture of nuclear fuel bundle assemblies 10 as shown in FIG. 1 of the drawings.
  • the nuclear fuel bundle assembly 10 is a self-contained unit comprised of a top nozzle assembly 12 and a bottom nozzle assembly 14, between which is disposed a matrix of nuclear fuel rods 18 arrayed in rows and columns and held in such configuration by a plurality of fuel rod grids 16.
  • control rods are included at selected positions within the array of nuclear fuel rods 18.
  • the assemblies 12 and 14 and the fuel rod grids 16 provide a skeletal frame to support the fuel rods 18 and the control rods.
  • the nuclear fuel bundle assemblies 10 are loaded into predetermined locations within a nuclear reactor and therefore, the orientation of the fuel rods 18 with respect to each other is rigorously controlled.
  • the present invention is, in one illustrative embodiment thereof, related to the manufacture of fuel rod grids 16 as shown in FIG. 2A.
  • the fuel rod grid 16 is of an approximately square configuration whose periphery is formed by four outer grid straps 22a, 22b, 22c, and 22d. Each end of an outer grid strap 22 is welded by a corner seam weld 30 to the end of a perpendicularly disposed outer grid strap.
  • Two sets of spaced, parallel inner grid straps 20 are provided, the straps of the sets being perpendicular to each other, whereby a plurality of square cells are formed to receive the control rods and the nuclear fuel rods 18.
  • the inner grid straps 20 have mating slots therein providing points 24 of intersection.
  • each of the inner grid straps 20 includes at each end a pair of tabs 26 of a size and configuration to be tightly received in top and bottom slots 28 formed in the outer grid straps 22, as shown in FIG. 2A.
  • a slot and tab weld 34 is effected along the top and bottom rows of slots 28 in the outer grid straps 22.
  • a plurality of guide sleeves 36 is disposed on the top-most surface of the fuel rod grid 16 to receive and guide the control rods disposed therein.
  • a series of seam welds 38 securely attach the guide sleeves 36 to corresponding notches 40 formed within the inner grid straps 20.
  • a precision laser welding apparatus is particularly adapted to perform a series of controlled welding operations whereby each of the welds 30, 32, 34, and 38 is carried out.
  • the precision laser welding apparatus as described and claimed in Westinghouse Ser. Nos. 414,247 and 414,263 not only controls the various parameters of generating the laser in terms of the pulse width and pulse height of each laser pulse and the number of pulses to be applied to each weld, but also controls the sequential positioning of the fuel rod grids 16 with respect to the laser beam. It is understood that after each such weld, the fuel rod grid 16 is repositioned and/or the focal point of the laser beam changed to effect the particular type of weld desired.
  • FIG. 2B discloses a portion of the grid 16, showing two of the sleeves 36 joined to certain of the inner grid straps 20.
  • FIG. 2C shows that there are provided, in each of the cells formed by four intersecting straps, resilient fingers 44 which have been stamped from the material of the straps during the operation which has formed the straps from a continuous strip of metal.
  • vanes 42 which extend from the various straps 20 and 22 and which lie at angles to the planes containing the straps from which they extend.
  • resilient spacing fingers 46 are also provided, at the bottom of the grid 16 as shown in FIG. 2C.
  • FIG. 2D there is shown, in detail, the specific grid and sleeve assembly in accordance with the present invention.
  • the sleeve 36 is a right cylinder, having an outer cylindrical surface 36a, a concentric inner cylindrical surface 36b, and annular end faces 36c and 36d.
  • a portion of an inner strap 20a is shown in elevation, and closely perpendicular thereto, and in spaced, closely parallel array are a pair of grid straps 20b, which are shown in cross section.
  • the sets of parallel grid straps which are uniformly spaced and in which the straps of one set are perpendicular to the straps of the other set, form a plurality of cells. Since the spacing of the straps are uniform, the cells are squares.
  • the upper edges of all of the straps lie substantially in a common plane.
  • Each of the straps 20a, 20b forming a cell with which a sleeve 36 is to be joined is provided with a rectangular notch 40 which is located centrally along the edge of the strap 20a as show in FIG. 2D which is between the two straps 20b.
  • the notch 40 comprises an edge 40a which is parallel to and spaced from the edge 20c of strap 20a, and the notch 40 is also formed by a pair of edges 40b which are perpendicular to the edges 40a and 20c and which define the lateral extent of the notch.
  • Each of the edges 40b is equidistant from the straps 20b.
  • a substantially identical notch 40 is provided in the edges of the four straps forming the cell, above which is the sleeve 36 shown in FIG. 2D.
  • the cylindrical sleeve 36 is in said four rectangular notches 40 in said four straps, and substantially engages the four straps.
  • the outside diameter of the sleeve 36 is substantially the same as the distance between the non-facing surfaces of the straps 20b, which is the outside surfaces of the straps as shown in FIG. 2D.
  • the sleeve 36 has an interference fit with the straps 20a and 20b at the notches 40 thereof.
  • the cylindrical sleeve 36 has substantial engagement with each of the edges 40a and 40b of each of the notches, and thus the lower face 36c of the cylindrical sleeve 36 seats upon the four edges 40a of the four notches.
  • the sleeve 36 once positioned as shown in FIG. 2D, is welded by a weld 38 which is effected at the edges 40b of a pair of opposite straps 20a, as shown in FIG. 2B.
  • the welding of the four edges of the two opposite straps is usually sufficient to provide a suitable, strong weld. This weld is accomplished through laser welding techniques. However, upon inspection, if it is found that one or more of the edges 40b which have been welded are not, in fact, satisfactory, the present construction provides an assembly in which corrective action may be taken at minimal expense to avoid rejection of the assembly. Such corrective action is the welding of the four edges 40b of the opposite pair of notches of the opposite straps, in the case of FIG. 2D, this being the notches of the straps 20b.
  • the herein disclosed construction provides a strong assembly, and one which, if a first welding operation results in an imperfectly welded structure, permits ready corrective action to be undertaken as hereinabove explained.
  • the notches are easily provided in the straps, during the initial manufacture of the strap from a continuous strip of metal, as by a standard punching operation.
  • the construction is such that the notch and sleeve will have a proper fitting relationship independently of the construction of the grid, as where other aspects or portions of the grid are not in accordance with specifications.
  • a further advantage is obtained in that no weld preparation is required, it being noted that the sleeves are self-locating because of the interfitting relationship with the notches in the four straps forming a particular cell.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Laser Beam Processing (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Fuel Cell (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
US06/414,232 1982-09-01 1982-09-01 Fuel grid with sleeves welded in notched grid straps Expired - Lifetime US4521374A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US06/414,232 US4521374A (en) 1982-09-01 1982-09-01 Fuel grid with sleeves welded in notched grid straps
IL69503A IL69503A0 (en) 1982-09-01 1983-08-16 Fuel grid for a nuclear reactor
ZA836077A ZA836077B (en) 1982-09-01 1983-08-17 Fuel grid with sleeves welded in notched grid straps
GR72316A GR78938B (es) 1982-09-01 1983-08-29
FR8313896A FR2532462B1 (fr) 1982-09-01 1983-08-30 Grille a barreaux combustibles avec des manchons soudes dans des bandes encochees
EG532/83A EG16815A (en) 1982-09-01 1983-08-30 Fuel grid with sleeves weldes in notched grid strips
BE211441A BE897642A (fr) 1982-09-01 1983-08-31 Grille a barreaux combustibles avec des manchons soudes dans des bandes encochees
BR8304815A BR8304815A (pt) 1982-09-01 1983-08-31 Conjunto de grade e chumaceira para combustivel de reator nuclear
ES525263A ES8702697A1 (es) 1982-09-01 1983-08-31 Conjunto de barras de combustible nuclear.
DE8383305078T DE3375341D1 (en) 1982-09-01 1983-09-01 Fuel grid with sleeves welded in notched grid straps
KR1019830004116A KR910004192B1 (ko) 1982-09-01 1983-09-01 홈이 파인 그리드 스트랩에서 용접된 슬리브를 갖는 연료그리드
EP83305078A EP0103444B1 (en) 1982-09-01 1983-09-01 Fuel grid with sleeves welded in notched grid straps
JP58159148A JPS5960386A (ja) 1982-09-01 1983-09-01 格子及びスリ−ブの組体

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/414,232 US4521374A (en) 1982-09-01 1982-09-01 Fuel grid with sleeves welded in notched grid straps

Publications (1)

Publication Number Publication Date
US4521374A true US4521374A (en) 1985-06-04

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Family Applications (1)

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US06/414,232 Expired - Lifetime US4521374A (en) 1982-09-01 1982-09-01 Fuel grid with sleeves welded in notched grid straps

Country Status (12)

Country Link
US (1) US4521374A (es)
EP (1) EP0103444B1 (es)
JP (1) JPS5960386A (es)
KR (1) KR910004192B1 (es)
BE (1) BE897642A (es)
BR (1) BR8304815A (es)
DE (1) DE3375341D1 (es)
EG (1) EG16815A (es)
ES (1) ES8702697A1 (es)
FR (1) FR2532462B1 (es)
GR (1) GR78938B (es)
ZA (1) ZA836077B (es)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4717527A (en) * 1984-07-02 1988-01-05 Westinghouse Electric Corp. Fuel assembly
US4762669A (en) * 1987-05-13 1988-08-09 Westinghouse Electric Corp. Nuclear reactor core containing fuel assemblies positioned adjacent core baffle structure having annular anti-vibration grids
US4873051A (en) * 1988-04-06 1989-10-10 Westinghouse Electric Corp. Nuclear fuel grid outer strap
US5359633A (en) * 1989-01-06 1994-10-25 Mitsubishi Nuclear Fuel Co. Assembly method and grid for nuclear fuel assembly
US5444748A (en) * 1994-04-04 1995-08-22 Westinghouse Electric Corporation Grid structure for supporting fuel rods in a nuclear reactor
US5488644A (en) * 1994-07-13 1996-01-30 General Electric Company Spring assemblies for adjoining nuclear fuel rod containing ferrules and a spacer formed of the spring assemblies and ferrules
US5519747A (en) * 1994-10-04 1996-05-21 General Electric Company Apparatus and methods for fabricating spacers for a nuclear fuel rod bundle
US5546437A (en) * 1995-01-11 1996-08-13 General Electric Company Spacer for nuclear fuel rods
US5566217A (en) * 1995-01-30 1996-10-15 General Electric Company Reduced height spacer for nuclear fuel rods
US5638416A (en) * 1993-12-03 1997-06-10 Mitsubishi Nuclear Fuel Co. Fuel assembly
US5675621A (en) * 1995-08-17 1997-10-07 General Electric Company Reduced height flat spring spacer for nuclear fuel rods
US6522710B2 (en) * 2001-07-03 2003-02-18 Westinghouse Electric Company Llc Fastened spacer for grid of a nuclear reactor with associated method
US6606369B1 (en) 2002-03-06 2003-08-12 Westinghouse Electric Company Llc Nuclear reactor with improved grid
US6819733B2 (en) 2002-05-15 2004-11-16 Westinghouse Electric Company Llc Fuel assembly and associated grid for nuclear reactor
US20060104403A1 (en) * 2004-11-16 2006-05-18 Westinghouse Electric Company Llc Method of fabricating a nuclear reactor fuel assembly grid
CN105014288A (zh) * 2015-08-20 2015-11-04 哈尔滨工业大学 用于核燃料组件定位格架的焊接夹具

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10146128B4 (de) * 2001-09-19 2005-03-03 Framatome Anp Gmbh Brennelement für einen Druckwasserreaktor

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791466A (en) * 1969-05-19 1974-02-12 Westinghouse Electric Corp Low parasitic capture fuel assembly structure
US3862884A (en) * 1970-01-14 1975-01-28 Babcock & Wilcox Co Fuel assembly for a nuclear reactor
US3920516A (en) * 1972-09-25 1975-11-18 Westinghouse Electric Corp Nuclear reactor fuel assembly arrangement
US3984284A (en) * 1973-08-03 1976-10-05 Exxon Nuclear Company, Inc. Spacer capture system for nuclear fuel assemblies
US4081324A (en) * 1976-06-17 1978-03-28 Exxon Nuclear Company Inc. Spacer capture rod to spacer grid attachment device
US4119490A (en) * 1976-01-12 1978-10-10 Commissariat A L'energie Atomique Nuclear fuel assembly
US4124443A (en) * 1973-10-09 1978-11-07 Kraftwerk Union Aktiengesellschaft Nuclear fuel-rod assembly support structure
US4175004A (en) * 1977-08-29 1979-11-20 The Babcock & Wilcox Company Fuel assembly guide tube
US4221636A (en) * 1977-07-07 1980-09-09 Commissariat A L'energie Atomique Grids for bringing about the spacing of a group of sheathed fuel rods in a nuclear reactor
US4239597A (en) * 1978-03-30 1980-12-16 The Babcock & Wilcox Company Nuclear fuel spacer grid
US4294660A (en) * 1977-10-07 1981-10-13 The Babcock & Wilcox Company Spacer assembly retainer arrangement

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
FR2070028A7 (en) * 1969-12-30 1971-09-10 Belgonucleaire Sa Fuel rod/control rod integral array - esp for pressurised water - cooled reactor
US4155807A (en) * 1976-09-22 1979-05-22 Westinghouse Electric Corp. Core and transition fuel assembly for a nuclear reactor
US4137125A (en) * 1976-11-12 1979-01-30 Westinghouse Electric Corp. Method of welding nuclear reactor fuel assemblies

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791466A (en) * 1969-05-19 1974-02-12 Westinghouse Electric Corp Low parasitic capture fuel assembly structure
US3862884A (en) * 1970-01-14 1975-01-28 Babcock & Wilcox Co Fuel assembly for a nuclear reactor
US3920516A (en) * 1972-09-25 1975-11-18 Westinghouse Electric Corp Nuclear reactor fuel assembly arrangement
US3984284A (en) * 1973-08-03 1976-10-05 Exxon Nuclear Company, Inc. Spacer capture system for nuclear fuel assemblies
US4124443A (en) * 1973-10-09 1978-11-07 Kraftwerk Union Aktiengesellschaft Nuclear fuel-rod assembly support structure
US4119490A (en) * 1976-01-12 1978-10-10 Commissariat A L'energie Atomique Nuclear fuel assembly
US4081324A (en) * 1976-06-17 1978-03-28 Exxon Nuclear Company Inc. Spacer capture rod to spacer grid attachment device
US4221636A (en) * 1977-07-07 1980-09-09 Commissariat A L'energie Atomique Grids for bringing about the spacing of a group of sheathed fuel rods in a nuclear reactor
US4175004A (en) * 1977-08-29 1979-11-20 The Babcock & Wilcox Company Fuel assembly guide tube
US4294660A (en) * 1977-10-07 1981-10-13 The Babcock & Wilcox Company Spacer assembly retainer arrangement
US4239597A (en) * 1978-03-30 1980-12-16 The Babcock & Wilcox Company Nuclear fuel spacer grid

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4717527A (en) * 1984-07-02 1988-01-05 Westinghouse Electric Corp. Fuel assembly
US4762669A (en) * 1987-05-13 1988-08-09 Westinghouse Electric Corp. Nuclear reactor core containing fuel assemblies positioned adjacent core baffle structure having annular anti-vibration grids
US4873051A (en) * 1988-04-06 1989-10-10 Westinghouse Electric Corp. Nuclear fuel grid outer strap
US5359633A (en) * 1989-01-06 1994-10-25 Mitsubishi Nuclear Fuel Co. Assembly method and grid for nuclear fuel assembly
EP0656632B1 (en) * 1993-12-03 1997-09-03 Mitsubishi Nuclear Fuel Co. Fuel assembly with fuel rod supporting members
US5638416A (en) * 1993-12-03 1997-06-10 Mitsubishi Nuclear Fuel Co. Fuel assembly
US5444748A (en) * 1994-04-04 1995-08-22 Westinghouse Electric Corporation Grid structure for supporting fuel rods in a nuclear reactor
US5488644A (en) * 1994-07-13 1996-01-30 General Electric Company Spring assemblies for adjoining nuclear fuel rod containing ferrules and a spacer formed of the spring assemblies and ferrules
US5519747A (en) * 1994-10-04 1996-05-21 General Electric Company Apparatus and methods for fabricating spacers for a nuclear fuel rod bundle
US5546437A (en) * 1995-01-11 1996-08-13 General Electric Company Spacer for nuclear fuel rods
US5566217A (en) * 1995-01-30 1996-10-15 General Electric Company Reduced height spacer for nuclear fuel rods
US5675621A (en) * 1995-08-17 1997-10-07 General Electric Company Reduced height flat spring spacer for nuclear fuel rods
US6522710B2 (en) * 2001-07-03 2003-02-18 Westinghouse Electric Company Llc Fastened spacer for grid of a nuclear reactor with associated method
US6606369B1 (en) 2002-03-06 2003-08-12 Westinghouse Electric Company Llc Nuclear reactor with improved grid
US6819733B2 (en) 2002-05-15 2004-11-16 Westinghouse Electric Company Llc Fuel assembly and associated grid for nuclear reactor
US20060104403A1 (en) * 2004-11-16 2006-05-18 Westinghouse Electric Company Llc Method of fabricating a nuclear reactor fuel assembly grid
US7149273B2 (en) * 2004-11-16 2006-12-12 Westinghouse Electric Co Llc Method of fabricating a nuclear reactor fuel assembly grid
CN105014288A (zh) * 2015-08-20 2015-11-04 哈尔滨工业大学 用于核燃料组件定位格架的焊接夹具

Also Published As

Publication number Publication date
ES8702697A1 (es) 1986-12-16
FR2532462B1 (fr) 1986-12-26
BE897642A (fr) 1984-02-29
EG16815A (en) 1989-06-30
BR8304815A (pt) 1984-04-10
JPS5960386A (ja) 1984-04-06
EP0103444A3 (en) 1984-09-05
EP0103444B1 (en) 1988-01-13
KR840006536A (ko) 1984-11-30
FR2532462A1 (fr) 1984-03-02
DE3375341D1 (en) 1988-02-18
KR910004192B1 (ko) 1991-06-24
JPS6341506B2 (es) 1988-08-17
ES525263A0 (es) 1986-12-16
EP0103444A2 (en) 1984-03-21
ZA836077B (en) 1984-04-25
GR78938B (es) 1984-10-02

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